Sparking device for hydrocarbon-engines.



H. HOVGARD.

SPARKING DEVICE FOR HYDROCARBON ENGINES. APPLICATION FILED SEPT 3. 1914.

LQW MQ, Patented Dec. 5,1916.

- fill BRUOKLIhTE, MllSSAGl-IUSETTS, .ASWQGNUR "JLG STAR G OMI-PANY, A. COBFOR-PMTIGN :5 MAINE.

Specification of vice a hydrocarbon engine and pertains cularly to a sparking device haw in coral therewith the usual sparking;

points spark plug combined with an induction coil with the provision oft means for keeping the coil at all times cooler than that portion of the device w iich screws into the lrvdroczu'bon engine cylinder and provided with the sparking poin ln order to illustrate shown in t accompanyi drawing one embodiment ereo'f whet Figure l 5. vertical section of a sparking device embodying my inventionw Fig. 2 is an inverted plan oi lli l and; Fig. 3 is a horizontal plan of l 1 looking in the direction of the arrow.

The words employed herein are used in the generic and descriptive sense and not primarily for the purpose of imposing limitations thereon.

Limitations of my'invention will be pointed out as near as possible in the appended my invention l he ve claims.

in the drawing represents the usual screw threaded body or spark plug portion of a sparking device of this character. The threaded portion 1]. is adapted to be screwed into the cylinder Walls of the hydrocarbon. engine. At the outer end of the spark plug 10 is a nut-like portion 12 by means of which a wrench may be coupled thereto so that the device can be rotated until it is screwed into the aforesaid cylinder. luteg'ral with the spark plug portion. 10 is acagc-like member 15 of any preferred type and provided at its upper end with a flanged annulus 16 separated from the nut by a plurality or preferably bowed arms 17.

The cage-like member may be provided with inwardly bowed arms as illustrated in the drawing or any similar and suitable age-like or open construction may be employed. This cage-like member l5 supports ll DEVICE FOR H lication filed September 3,

INSTRUMENT.

lMlClkZEtllGhl-Elll 4?? swarm-11m Letters ."Eatent.

1914:. Serial lilo. lfidltldtl.

and separates an induction coil casing 2U preferably insulating material from s a plug portion 10. Tillie case 20 is secured to the annulus 16 in any suitable manner and rests upon mica or other insulating dis s 2-1 forming theretor. At the up per end of the said casing is a cap or cover 22 and, with the casing and the aforesaid insulating disks, forms a closed chamber 23 within which located the usual induction coil. The said coil comprises the usual pri mary coil 25 in circuit with terminals 26 and 2? upon the cap 2 lhe said coil surrounds the usual 'core 28 and in turn is surrounded by the secondary coil 30. The said secondaray coil is connected at 31 to the annulus 16 thereby forming; the ground for one spark jointand the other end of said coil is connected at 32 to an insulated electrode 33 extending axially of the induction.

sulator is seated at 38 in a counter-bore in the top of the spark plug; and 'ei'rtends uppvard entering an orifice 39 in the insulated disk 21. lnipervious cement may be used about the joints of the porcelain insulator in the recess or counterbored portion-88 and the orifice 9.9 to guard against moisture creeping between the porcelain insulator and the spark plug portion 10 or between said insulator and the disk 21. The insulating material is shouldered at 4:2 to engage a corresponding shoulder in the spark plug portion 10 so that the shoulder 42 and the said insulation cannot be forced upward when {an explosion occurs'in the hydrocarbon-e1 gins. The said electrode 33 is provided with a sparking point t4 coo'perating with a discharging terminal 45 secured to the spark plug 10. This terminal be of any suitable configuration or de sign that may be desired and shown herein as consisting of a U shaped. piece of wire extending beneath the igniter point 44 and. then upwardly and is fixed in the spark plug portion 10. Devices 0'? this character require an interrupter or vibrator of some sort but any device of this character may be employed in any part of the primary circult and is not illustrated herein,

Con siderable difficulty is experienced in connectionwith the use of sparking devices embodying the igniter points and the induction coil as a single unit. The extreme heat communicated to the usual spark plug --When in operation is conveyed to the casing surrounding the induction'coil 1O heating said coil clianging the electrical resistance thereof and giving rise to a certain class of difficulty'and in' addition breaks down the insulation of the induction coil and after respect to both the spark plug portion 10 and the annulus '16 and are preferably bowed although I contemplate using straight arins ifldesired. If the said arms extended straighy upward and parallel with the ancient the spark plug-they would elongate in that direction causing the annulus 16 to be'move'd away from the spark'plug thereby causing the difi'er'ent members to separate or pull one member from the other member separating the insulator and causing a short circuit or permit moisture entering between the crevices resulting in further trouble. By

extending the arms in an angular direction and especially by bowing the same, the tendency of the expansion of the said arms would not be directly upward but would be outward or in an angular direction. In the case of bowing the said elongation will cause a greater amount of inward deflection with relatively less elongation thereof and no separation will occur with respect to the co operating parts. The relative amount of expansion of the arms 17 can therefore be calculated to equal the expansion 01 the porcelain insulator 37, the insulated electrode etc. and all parts including said arms 17 will be cooler than in the case of simi lar devices. Another advantage in bowing the said arms is that it permits oi: use of greater radiating surface for such arms and still permits of the use of a small and thin design thereof.

'1 have described herein one embodiment 01" my invention; but it is not to be understood that the latter is not essentially limited to the specific details of construction and organization of said embodiment, since the same may be varied without departing from the proper scope of the claims.

Claims. 1. In asparking device, a casing contuiu- .ing an induction coil, a screw threaded body,

and radial arms connecting said casing and said screw threaded body.

2. In a sparking device, a casing containing an induction coil, a screw threaded body, and a plurality of bowed radial arins 'connecting said casing and said screw threaded body.

3. In a sparking device, a casing containing an induction coil, a screw threaded body, and a plurality of radiz'iting arms separating said casing and said body and connected to each.

4. In a sparking device, a coil. casing, screw threaded body. a plurality of substantially radial arms disposed angularly in the transverse direction between said casing and said body and separating them one from the other, and an insulated electrode extending axially of said casing and said body and extending from one to the other.

5. In a sparking device a casing containing an induction coil, a screw threadedbody, a plurality of substantially radial arms lictii'iaeii said casing and said body and connecting them one to the other, and an insulated electrode extending through the said body and abutting said casing, said electrode being in circuit with one side oi. the secondary of the induction coil.

in testimony whereof, I have signed in name to this specification, in the presence of two subscribing witnesses.

' HLKRRY lxl OVt-ln RD. Vitnesses Airrnna F. ta N DA Ln, EDWIN T. linen. 

